Sealing Ring Asymmetric Guide Web Grease Management
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Solution Overview
Problem
Radial shaft seals face challenges in maintaining performance characteristics over a long service life when retaining grease, as the seal can harden and fail to track high dynamic deflection movements of the machine element without significant changes in contact pressure.
Innovation Solution
A sealing ring design featuring a dynamically loaded sealing lip with a tension element in a mounting groove, where the guide webs have different diameters creating a C-shaped joint space that widens axially, preventing grease accumulation and allowing it to flow out, and optionally using friction-reducing surface coatings or a foam member for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional radial shaft seal with equal diameter guide webs is used, then the seal structure is simple and easy to manufacture, but grease accumulates in the joint space causing the seal to harden and fail to track dynamic movements
Solution Approach 1:
The patent applies asymmetry by configuring the first guide web with a larger diameter than the second guide web. This asymmetric design creates a C-shaped joint space that widens axially, preventing grease accumulation and allowing the sealing lip to maintain flexibility and track dynamic movements throughout service life.
2Stability of the object's composition
If the joint space is closed, then grease is retained inside the seal, but the sealing lip hardens and loses flexibility to track dynamic deflection movements
Solution Approach 1:
The patent applies dynamics by designing the joint space as open rather than closed, allowing grease to flow out and preventing hardening. This dynamic configuration enables the sealing lip to maintain its flexibility and adaptability to track high dynamic deflection movements of the machine element throughout its service life.
3Quantity of substance
If grease accumulates in the joint space, then the joint space is filled, but the seal hardens and contact pressure changes significantly over time
Solution Approach 1:
The patent applies the extraction principle by designing the joint space to allow grease to flow out rather than accumulate. The asymmetric guide web configuration creates an open C-shaped space that extracts grease from the joint space, preventing hardening and maintaining stable contact pressure over the seal's service life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design ensures the sealing ring maintains constant contact pressure and flexibility, preventing grease accumulation and allowing it to follow high dynamic deflection movements, while keeping the seal effective over a long service life without significant changes in contact pressure.
Implementation Method 1
a tension element (3), wherein the tension element is configured to stabilize the sealing lip (1) in the radial direction (4)
Implementation Method 2
the first guide web, axially facing the joint, has a first diameter, wherein the second guide web, facing axially away from the joint, has a second diameter, and wherein the first diameter is larger than the second diameter
Data Source
AI summary
A sealing ring with a dynamically loaded sealing lip having a sealing edge and a tension element for stabilizing the sealing lip in the radial direction, wherein: the tension element is arranged in a mounting groove; the mounting groove is arranged in the sealing lip on the side facing radially away from the sealing edge and has a mounting opening on the side facing radially away from the sealing edge, which opening is delimited by two guide webs arranged so as to be adjacent to each other at a spacing in the axial direction; the sealing lip is articulated, on its side facing axially away from the sealing edge, to a support member with a joint; and the sealing lip and the support member delimit, with their sides which radially face each other, a substantially C-shaped joint space which is open on one side in the axial direction.